What are two examples of an endothermic reaction and what are two examples of an ectothermic reaction?

Use the electron-transfer method to balance this equation: Zn (s) + HCl (aq) → ZnCl2 (aq) + H2 (g) a. 2Zn (s) + HCl (aq) → ZnCl2 (aq) + H2 (g) b. Zn (s) + 2HCl (aq) →ZnCl2 (aq) + H2 (g) c. Zn (s) + HCl (aq) →ZnCl2 (aq) + H2 (g) d.

The density of air under ordinary conditions at 25 degrees * C is 1.19g / L. How many kilograms of air are in a room that measures 9.0ft * 11.0ft and has a 10.0 ft ceiling?

A substance whose shape can easily change is a a. solid. b. powder. c. fluid. d. metal.

Does a pool of water and a piece of ice have different chemical properties?

2.45 mol / 1.25 liter

How does the shape of a structure affect its overall strength

Kim is doing an experiment with sound waves. She tested to see how quickly a sound wave could travel through three different materials: a metal pole, a helium balloon and a glass of water. She recorded her results.

Which of the following is an example of an electric force that occurs in atoms

5. What is another name for Newton's first law in your own words.

The molar mass of magnesium (Mg) is 24.30 g/mol. There are 6.02 1023 atoms in 1 mol. How many atoms are present in 48.60 g of Mg? 3.32 10^-24 atoms 1.96 10^-21 atoms 1.20 10^24 atoms 7.11 10^26 atoms